Detection method of hump point and unstable flow of vane pump based on pressure pulsation
A pressure pulsation and detection method technology, applied in pump control, non-variable pumps, machines/engines, etc., can solve problems such as unstable flow, inability to obtain pump hump points intuitively and accurately, and achieve simplified detection Effect
Inactive Publication Date: 2020-05-15
XIHUA UNIV
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Problems solved by technology
[0007] The purpose of the present invention is to provide a pressure pulsation-based detection method for the vane pump hump point and unstable flow. This method solves the problem that the existing detection method cannot directly and accurately obtain the pump hump point, and can accurately and clearly reflect the The working condition of the hump point of the pump, and can realize the acquisition of unstable flow states such as backflow in the pump and rotating stall
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[0019] The technical solutions in the embodiments of the present invention will be clearly and completely described below. Obviously, the described embodiments are only some of the embodiments of the present invention, but not all of them. Based on the embodiments of the present invention, all other embodiments obtained by persons of ordinary skill in the art without making creative efforts belong to the protection scope of the present invention.
[0020] A vane pump hump point detection method based on pressure pulsation, the method includes: measuring the pressure pulsation signal at the outlet of the vane pump, performing power spectral density transformation on the pressure pulsation signal at the outlet of the vane pump, and obtaining the power spectral density of the pressure pulsation at the pump outlet at twice the The relationship between the extreme value at the shaft frequency and the flow rate changes, and the corresponding flow point when the extreme value reaches ...
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The invention discloses a vane pump hump point and unsteady flow detection method based on pressure pulsation of unsteady flow. The detection method comprises the steps that a pressure pulsation signal of an outlet of a vane pump is measured, power spectral density conversion is carried out on the pressure pulsation signal of the outlet of the vane pump, a relationship between an extreme value anda flow change of the power spectral density of the pressure pulsation of the outlet of the vane pump at two times shaft frequency is obtained, and when the extreme value reaches a maximum value pointin the flow changing process, a corresponding flow point is a hump point of the vane pump. According to the vane pump hump point and unsteady flow detection method based on the pressure pulsation, the hump point working condition of the vane pump can be accurately and obviously reflected, and the obtaining of pump internal reflux, rotating stall and other unsteady flow states can be realized.
Description
technical field [0001] The invention relates to a method for detecting the flow state of a fluid machine, in particular to a method for detecting the hump point and unstable flow of a vane pump based on pressure pulsation. Background technique [0002] As an important energy conversion device and fluid delivery equipment, vane pump is widely used in various fields of national economy, including agricultural irrigation, petrochemical industry, marine oceangoing, aerospace, biopharmaceutical and artificial heart, etc. During the operation of the pump, some pumps have hump characteristics due to design reasons. When the pump flow increases from zero, the pump head first gradually increases and then decreases. The point corresponding to the pump head increasing to the maximum working condition in this process is called the hump point. [0003] When the pump operates in a flow range smaller than that corresponding to the hump point, extremely unstable flow phenomena such as rota...
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IPC IPC(8): F04D15/00
CPCF04D15/0088
Inventor 卢加兴刘小兵曾永忠华红余志顺付宇帆
Owner XIHUA UNIV